I've seen one game where any shields were only allowed to be one layer of cardboard thick, and you were only allowed one for the whole twenty-four hours. The few that has a shield lost them very quickly because they were Swiss-cheesed. The year before they had plywood shields with gun holes and windows in them. Four guys would move together as a wall, and they had a medic with them. If you hit one of them, they'd all hunker down together, medic back in, and then continue on. There was a rule that grenades would stop riot shields, but they never called those hits. Eventually we set a trap for them. Led them under a sniper's watch in the dark (a big hole in the cement wall of a building), and sprayed them about the top of their heads mercilessly. Then their shields went missing....somehow. Weird eh?
From a realism standpoint they don't make a lot of sense. There's the weight thing, but taking consecutive rounds close range will either deplete your shield or knock you on your butt.
From a sports perspective they make less sense. Really an unsportsmanlike tool, almost as bad as not calling your hits. If you need a shield, why are you playing?
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